Erectile dysfunction treatments: Viagra Connect vs Cialis Together and Eroxon

Erection problems are common, and some treatments are available to buy without a prescription.

Drugs such as Viagra Connect and Cialis usually come in pill form, but there are topical gels available, too – such as Eroxon  – for a drug-free alternative. 

Here, we explain how the different options work, with expert input from Which? scientist Kamisha Darroux and GP Dr Donald Grant.

Find out how you can access treatments, how they work, and what your options are – including how to get the best value when buying and make sure you buy legitimate products that are safe to use.

How does Viagra work?

Viagra Connect contains the active ingredient sildenafil. It works by increasing blood flow around the body. In men, this can help with getting and maintaining an erection during sexual arousal.

Dr Grant explains: 'Viagra works by relaxing blood vessels and blocking an enzyme that can interfere with erections. It helps men achieve and maintain an erection more easily.'

How long does Viagra last?

Viagra usually works for 4 to 6 hours, though some factors can influence that. 'You’ll get the best results around an hour after taking it,' says resident Which? scientist, Kamisha Darroux. 'But it can start working in just 30 minutes.'

Eating a heavy or fatty meal beforehand? It might take longer to kick in. Alcohol? That could reduce how well it works altogether. 

Stress and tiredness can also get in the way. Kamisha says it's recommended to take it on an empty stomach and avoid alcohol for the best results.

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Erectile dysfunction drugs: what's available without a prescription?

There are two main types of erectile dysfunction drug available over the counter:

• Viagra Connect (containing active ingredient sildenafil) 
• Cialis Together (active ingredient: tadalafil). 

Both are available at pharmacies without a prescription, after completing a brief consultation with the pharmacist / filling out a form (online or in-person) to check they are safe and appropriate for you to take. 

Viagra Connect vs Cialis Together vs Eroxon – what's the difference?

You might have seen several drugs advertised for erectile dysfunction issues. 

Over-the-counter drug options typically contain one of two active ingredients: sildenafil (Viagra Connect) or tadalafil (Cialis Together or Avarante).

Both are used to treat Erectile Dysfunction (ED), but there are some differences:

• Duration: Viagra Connect lasts up to 4 hours; Cialis can last up to 36 hours.
• Dosage style: Viagra is taken as needed. Cialis has a daily low-dose option, too (Cialis Daily), but it is important to note that daily low-dose versions are strictly prescription-only and cannot be bought over the counter.

Both the 'take as needed' versions take around 30-60 minutes to kick in. 

How to get the best price on ED drugs

Some pharmacies do their own or generic versions of these drugs, which are typically cheaper. Look for the active ingredient sildenafil or tadalafil.

'Viagra is like Nurofen,' explains Kamisha. 'Sildenafil is like ibuprofen. One has the fancy name and higher price, but both do the same job.'

Dr Grant agrees: 'There’s no medical difference. Go for the cheaper option – it will work just as well.'

These products have all been approved as 'over the counter' pharmacy medicines, meaning men over 18 can buy them subject to a few quick pharmacy checks (to ensure they are suitable for you and won't interfere with any medication you're taking or other health conditions you might have). 

There are versions of these drugs available via prescription, and some alternatives. If you're not sure what's right for you (or, indeed, what's wrong), it's worth discussing it with your pharmacist or GP.

We checked prices of the main options and generic alternatives, and found that generic options are often around half the price, so it's worth seeking them out.

Note: Prices and cheapest retailers last checked June 2026. Prices are indicative of difference in cost between options /brands, do check before you buy as cheapest retailers may change frequently.

Non-medication treatments for erectile dysfunction

There are also some topical gels that offer a drug-free option. These include Eroxon, a gel that is applied to the head of the penis. It stimulates nerve endings with a cooling and warming sensation that, according to Eroxon, will help achieve erection when combined with sexual stimulation. 

The brand says it's suitable for people with mild to severe erectile dysfunction.

Since Eroxon works physically, instead of pharmacologically, it's suitable for people who can’t use Viagra (though always double-check and read the information leaflet). 

If you have certain conditions such as heart problems it's still advised to get medical input first as sexual activity may put a strain on your heart, and ED can be an early sign of some more serious illnesses. 

While you can also buy Viagra without a prescription, a pharmacist will need to ask you some screening questions first. If you order online, you'll need to answer a questionnaire. 

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Where to buy Viagra Connect and other ED drugs – and how much does it cost?

You can buy the over-the-counter versions of Viagra, Cialis and generic alternatives at pharmacies in the UK. 

Whether online or in-person, you'll need to fill out a quick questionnaire first. This is so a pharmacist can check it's safe for you to take. 

If buying online, make sure you opt for a trusted pharmacy that is registered with the General Pharmaceutical Council (GPhC).

This is really important. Recent reports by the MHRA have highlighted the massive trade in dodgy illegal ED drugs online which can pose a serious risk to your health. And our own investigation found some unscrupulous sellers chucking in unknown pills for free when buying online.

Prices are typically around £22 for a pack of 4 tablets (approx £5.50 per tablet). You can see current prices for the main branded drugs here:

• Viagra Connect is also available at: Asda, Lloyds Pharmacy and Superdrug and most pharmacies

• Cialis Together is also available at: Lloyds Pharmacy, Superdrug and Well Pharmacy and most pharmacies

Please note that we have not tested or reviewed these products, prices and retailers are listed for information only, and we aren't able to show every retailer.

Is Viagra safe?

For most people, yes. 'Over-the-counter Viagra (Viagra Connect or generic alternatives) is only available in a 50mg dose,' says Kamisha. 'It’s safe for healthy men, but people with heart issues or on certain medications should talk to a doctor or pharmacist first.' 

This is why you'll be asked to fill out a questionnaire before buying.

Viagra causes widening of blood vessels. That’s great for blood flow, but risky if you’re also taking anything that affects blood pressure, like nitrates. 'Mixing them can be dangerous,' Kamisha warns.

Natural Viagra alternatives

Before jumping to medication, it’s worth looking at lifestyle factors that may be contributing to your erectile dysfunction issues. 

Stress, poor sleep, alcohol, and smoking can all play a role in ED. 'Persistent ED can also signal other health problems,' warns Dr Grant. “High blood pressure, diabetes, low testosterone - these are all linked.”

It's worth chatting with your GP in the first instance, rather than reaching for the pills, to rule out anything else.

How common is erectile dysfunction?

Erectile dysfunction is an incredibly common condition that can affect men of any age.

Despite this, there is a stigma that can cause men to mask the condition and avoid coming forward for treatment or advice. But persistent erectile dysfunction can indicate various underlying health conditions. 

Dr Grant tells us; 'As ED is linked so closely to blood flow, it can be a massive indicator of cardiovascular issues, such as high blood pressure, high cholesterol or diabetes.

Low testosterone levels can impact men’s ability to maintain an erection while also dramatically reducing libido. If ED is occurring often or slowly getting worse, I strongly advise men to seek an open and honest conversation with their GP, who can advise further on tailored treatment options.'

You can find out more about erectile dysfunction, including possible causes and treatment options, on the NHS website.

Viagra side effects and how to deal with them

Most side effects are mild, such as headaches, nausea, or a stuffy nose. But if you feel dizzy or your erection lasts longer than four hours (yes, it happens), you should seek help right away. 

It’s not addictive, but if you feel like you’re relying on it without dealing with the root cause, it’s time to check in with your GP.

Can women take Viagra?

No, Viagra isn’t approved for use in women.

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Meet our experts

For our guide to erectile dysfunction drugs, we worked with our in-house scientist and sought advice from a GP, as well as researching the products available, your most searched-for questions, and checking prices. Our experts for this guide were:

Kamisha Darroux, Principal Scientific Adviser at Which?

Kamisha has a BSc in Pharmacology and a passion for skincare. She has been part of the Which? in-house science team since 2017. In her capacity as scientific adviser Kamisha has worked across a huge range of projects covering everything from product safety investigations to face mask testing and analysis.

Dr Donald Grant, GP and Senior Clinical Advisor at The Independent Pharmacy

Dr Grant qualified as a Doctor in Bristol in 1985. He has wide clinical experience as a GP in and around Bristol. 

He is the senior clinician at The Independent Pharmacy.